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Edit File : dump.py \| Size : 3.46 KB
# Mimic the sqlite3 console shell's .dump command # Author: Paul Kippes <kippesp@gmail.com> # Every identifier in sql is quoted based on a comment in sqlite # documentation "SQLite adds new keywords from time to time when it # takes on new features. So to prevent your code from being broken by # future enhancements, you should normally quote any identifier that # is an English language word, even if you do not have to." def _iterdump(connection): """ Returns an iterator to the dump of the database in an SQL text format. Used to produce an SQL dump of the database. Useful to save an in-memory database for later restoration. This function should not be called directly but instead called from the Connection method, iterdump(). """ writeable_schema = False cu = connection.cursor() cu.row_factory = None # Make sure we get predictable results. yield('BEGIN TRANSACTION;') # sqlite_master table contains the SQL CREATE statements for the database. q = """ SELECT "name", "type", "sql" FROM "sqlite_master" WHERE "sql" NOT NULL AND "type" == 'table' ORDER BY "name" """ schema_res = cu.execute(q) sqlite_sequence = [] for table_name, type, sql in schema_res.fetchall(): if table_name == 'sqlite_sequence': rows = cu.execute('SELECT * FROM "sqlite_sequence";').fetchall() sqlite_sequence = ['DELETE FROM "sqlite_sequence"'] sqlite_sequence += [ f'INSERT INTO "sqlite_sequence" VALUES(\'{row[0]}\',{row[1]})' for row in rows ] continue elif table_name == 'sqlite_stat1': yield('ANALYZE "sqlite_master";') elif table_name.startswith('sqlite_'): continue elif sql.startswith('CREATE VIRTUAL TABLE'): if not writeable_schema: writeable_schema = True yield('PRAGMA writable_schema=ON;') yield("INSERT INTO sqlite_master(type,name,tbl_name,rootpage,sql)" "VALUES('table','{0}','{0}',0,'{1}');".format( table_name.replace("'", "''"), sql.replace("'", "''"), )) else: yield('{0};'.format(sql)) # Build the insert statement for each row of the current table table_name_ident = table_name.replace('"', '""') res = cu.execute('PRAGMA table_info("{0}")'.format(table_name_ident)) column_names = [str(table_info[1]) for table_info in res.fetchall()] q = """SELECT 'INSERT INTO "{0}" VALUES({1})' FROM "{0}";""".format( table_name_ident, ",".join("""'\|\|quote("{0}")\|\|'""".format(col.replace('"', '""')) for col in column_names)) query_res = cu.execute(q) for row in query_res: yield("{0};".format(row[0])) # Now when the type is 'index', 'trigger', or 'view' q = """ SELECT "name", "type", "sql" FROM "sqlite_master" WHERE "sql" NOT NULL AND "type" IN ('index', 'trigger', 'view') """ schema_res = cu.execute(q) for name, type, sql in schema_res.fetchall(): yield('{0};'.format(sql)) if writeable_schema: yield('PRAGMA writable_schema=OFF;') # gh-79009: Yield statements concerning the sqlite_sequence table at the # end of the transaction. for row in sqlite_sequence: yield('{0};'.format(row)) yield('COMMIT;') Back

Edit File : dump.py | Size : 3.46 KB

# Mimic the sqlite3 console shell's .dump command
# Author: Paul Kippes <kippesp@gmail.com>

# Every identifier in sql is quoted based on a comment in sqlite
# documentation "SQLite adds new keywords from time to time when it
# takes on new features. So to prevent your code from being broken by
# future enhancements, you should normally quote any identifier that
# is an English language word, even if you do not have to."

def _iterdump(connection):
    """
    Returns an iterator to the dump of the database in an SQL text format.

Used to produce an SQL dump of the database.  Useful to save an in-memory
    database for later restoration.  This function should not be called
    directly but instead called from the Connection method, iterdump().
    """

writeable_schema = False
    cu = connection.cursor()
    cu.row_factory = None  # Make sure we get predictable results.
    yield('BEGIN TRANSACTION;')

# sqlite_master table contains the SQL CREATE statements for the database.
    q = """
        SELECT "name", "type", "sql"
        FROM "sqlite_master"
            WHERE "sql" NOT NULL AND
            "type" == 'table'
            ORDER BY "name"
        """
    schema_res = cu.execute(q)
    sqlite_sequence = []
    for table_name, type, sql in schema_res.fetchall():
        if table_name == 'sqlite_sequence':
            rows = cu.execute('SELECT * FROM "sqlite_sequence";').fetchall()
            sqlite_sequence = ['DELETE FROM "sqlite_sequence"']
            sqlite_sequence += [
                f'INSERT INTO "sqlite_sequence" VALUES(\'{row[0]}\',{row[1]})'
                for row in rows
            ]
            continue
        elif table_name == 'sqlite_stat1':
            yield('ANALYZE "sqlite_master";')
        elif table_name.startswith('sqlite_'):
            continue
        elif sql.startswith('CREATE VIRTUAL TABLE'):
            if not writeable_schema:
                writeable_schema = True
                yield('PRAGMA writable_schema=ON;')
            yield("INSERT INTO sqlite_master(type,name,tbl_name,rootpage,sql)"
                  "VALUES('table','{0}','{0}',0,'{1}');".format(
                      table_name.replace("'", "''"),
                      sql.replace("'", "''"),
                  ))
        else:
            yield('{0};'.format(sql))

# Build the insert statement for each row of the current table
        table_name_ident = table_name.replace('"', '""')
        res = cu.execute('PRAGMA table_info("{0}")'.format(table_name_ident))
        column_names = [str(table_info[1]) for table_info in res.fetchall()]
        q = """SELECT 'INSERT INTO "{0}" VALUES({1})' FROM "{0}";""".format(
            table_name_ident,
            ",".join("""'||quote("{0}")||'""".format(col.replace('"', '""')) for col in column_names))
        query_res = cu.execute(q)
        for row in query_res:
            yield("{0};".format(row[0]))

# Now when the type is 'index', 'trigger', or 'view'
    q = """
        SELECT "name", "type", "sql"
        FROM "sqlite_master"
            WHERE "sql" NOT NULL AND
            "type" IN ('index', 'trigger', 'view')
        """
    schema_res = cu.execute(q)
    for name, type, sql in schema_res.fetchall():
        yield('{0};'.format(sql))

if writeable_schema:
        yield('PRAGMA writable_schema=OFF;')

# gh-79009: Yield statements concerning the sqlite_sequence table at the
    # end of the transaction.
    for row in sqlite_sequence:
        yield('{0};'.format(row))

yield('COMMIT;')

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